The famous family spent USD two million on the star-studded celebration held at The Lots studio in West Hollywood, Los Angeles, reported Female First.
Daughters Kendall and Kylie Jenner both opted for sparkling silver outfits, with the former accessorising with a blonde wig.
Kourtney was also seen enjoying the night, dressed in a black trouser suit, which she teamed with a white blouse.
Kim Kardashian, 35, who is expecting her second child, arrived at the party with husband Kanye West, in a stunning gown whilst sister Khloe Kardashian opted for a beautiful white dress, complete with silver detailing and a matching hat.
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Other celebrities joining the family for the birthday bash included close pals Chrissy Teigen and John Legend, as well as Boy George.
The invites were sent out from all of Kris' children including Rob Kardashian, who was not spotted at the party.
The invite read, "Because we love her... Please share in our excitement at a special birthday celebration honoring Kris.